Pressing Ctrl+Alt+Del on the keyboard causes a host to lose connection. What should I do?

Symptom

The host loses connection. The message log shows a virtual USB device being attached and a Received SIGINT signal.

Cause

The Ctrl+Alt+Del key combination was pressed on the host.

Solution

• Modify the system configuration file to disable the Ctrl+Alt+Del key combination.

  1. Log in to the host console as root.

  2. Run vi /etc/systemd/system/ctrl-alt-del.target to open the ctrl-alt-del.target file in edit mode.

  3. Add the following content to the ctrl-alt-del.target file:

     [Unit]
     Description=Disable Ctrl-Alt-Del
     
     [Service]
     ExecStart=/bin/true
     Type=oneshot
     
     [Install]
     WantedBy=multi-user.target

  4. Save the changes and exit the file editor.

  5. Run systemctl daemon-reload to reload the systemd configuration.

  6. Run systemctl mask ctrl-alt-del.target to disable ctrl-alt-del.target.

  7. Restart the system for the changes to take effect.

     Restarting may affect running services. Assess the impact before proceeding.

• Security training: Train operations personnel not to use the Ctrl+Alt+Del key combination to prevent accidental host disconnection.

• Physical protection: Secure the host by installing cabinet door locks, security cameras, and other measures to prevent unauthorized access.